Mittendorff, Martin
Wendler, Florian
Malic, Ermin
Knorr, Andreas
Orlita, Milan
Potemski, Marek
Berger, Claire
de Heer, Walter A.
Schneider, Harald
Helm, Manfred
Winnerl, Stephan
Article History
Received: 20 March 2014
Accepted: 20 October 2014
First Online: 24 November 2014
Competing interests
: The authors declare no competing financial interests.